js实现List

/** * js实现list *  */function List() {    this.value = [];    /* 添加 */    this.add = function(obj) {        return this.value.push(obj);    };    /* 大小 */    this.size = function() {        return this.value.length;    };    /* 返回指定索引的值 */    this.get = function(index) {        return this.value[index];    };    /* 删除指定索引的值 */    this.remove = function(index) {        this.value.splice(index,1);        return this.value;    };    /* 删除全部值 */    this.removeAll = function() {        return this.value = [];    };    /* 是否包含某个对象 */    this.constains = function(obj) {        for ( var i in this.value) {            if (obj == this.value[i]) {                return true;            } else {                continue;            }        }        return false;    };        /* 是否包含某个对象 */    this.getAll = function() {        var allInfos = '';        for ( var i in this.value) {            if(i != (value.length-1)){                allInfos += this.value[i]+",";            }else{                allInfos += this.value[i];            }        }        alert(allInfos);        return allInfos += this.value[i]+",";;    };    }